Ignition-magneto for internal-combustion engines



fag/0me APPLICATION FILED APR. 25, IBI?.

I E MAUVERT IGNITION MAGNETO FOR INTERNALCOMBUSTION ENGINES. 1,334,918.

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E. MALIVEHT.

IGNITION IVIAGNETO FOR INTERNAL COIVIBUSTION ENGINES.

- APPLICATION FILED APII.25, 19u.

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tudI b?" /N VE N 70H fag/area Maki/@wi BWM I A T TOR/vf y@ Patented Mar. 23, 1920.

l UNITED STATES PATENT. oFFIcE.

EUGNE MALIVERT, 0F PARIS, FRANCE, ASSIG-NOR T0 HIMSELF AND SAINTAGNE, OF PARIS, FRAN GE.

HIPPOLYTE IGNITION-MAGNETO FOR INTERNAL-COIQBUSTION ENGINES.

Specification of Letters Patent. Patented Mal. 23, 1920.4

Application filed April 25, 1917. Serial No. I164,383.

To all 'whom t may concern.'

Be it known that I, EUGNE MALIVERT, a citizen of the Republic of France, and resif dent of 17 VRue du Pr-Saint-Gervais, Paris,y France, have invented a certain new and useful Improvement in Ignition-Magnetos for Internal-Combustion Engines, of which the following is a specification.

The present invention has for its object an improvement applied to high or low tension ignition magnetos for producing sparks at the ignition plugs of internal combustion engines.

`It is' known on the one hand that in order to o'btain the variation of the moment of ignition with' a high-tensionimagn'eto, the Y cuit is made when the armature is in another tions havel been proposed enabling a spark fr ofthe same energy to be obtained whatever be the moment of rupture of the primary circuit.

Notably it has been proposed to displace the magnetic field at the same time as the cam box; it has also been proposed to employ shutters or movable pole pieces within the magnetic field, permitting the poles and armatures to be displaced at the Sametime as, the cam box'. This arrangement always insures a maximum of energy in the induction spark, for at the moment when theJ break takes place the armature is always pole pieces.

at the same distance from the pole `pieces whatever may lbe the position of advance or of retard, but it presents certain diiliculties of construction, for in this construction th' rmovable pole-pieces are' generally of the same length as that of the fixed pole pieces,

and are joined together by cheeks carried in two bearings; this arrangement has the inconvenience of necessitating very great -pre.` cision, not only in the erection, but also in the mounting of these cheeks to insure that the movable polev pieces turn absolutely concentrically at the same time as the fixed pole pieces and the armature, and that the air gap is always kept very low.

The present invention has for its object a special arrangement and a particular method of mounting the movable pole pieces designed and arranged with a view of getting rid of the disadvantages above re, ferred to. 4 v

This invention consists in the employment, in combination with the ignition magnetos,

of movable pole pieces characterized by this fact, thatthey havea width substantially equal to that of the armature core, and that they are received in a circular groove'insthe fixed pole pieces.

Movement is .imparted to these movable pole pieces in any suitable manner; this control may be independent of that of the cam box or mav be connected to the latter in order that Jthe displacement of the magneticV i lield will correspond with the displacement of the armature in the different break positions.V Y

The present arrangements of movable pole pieces recessed in the pole pieces'of the magv netic field permits the construction of the regulating -means to be simplified and of considerably reducing the cost of manufacture.

example the application of the present Aregulating means to a magneto of usual construction.

Figure 1 is a vertical Ysectlon of the magneto.

linebA-A of Fig. 1.

Fig. 2a-is a detail view',of the armature andthe movable pole pieces, the pole piecesbeing insection. j

Fig.' Sis a detail view of one of the fixed The annexed drawing shows byf way of f Fig. 2 is a horizontal section made on the Figs. 4 and y5 show tworkmethods of mounting the movable pole pieces.

Fig. 6 is a detail view. Fig. 7 shows in vertical section the appllcation of the movable pole piecesI for de- \viating the magnetic iux between the iixed Ypole pieces.

Fig. 8 shows in vertical section the application of the arrangement for creating a resistance t0 the passage of the magnetic fluXin the armature.

Fig. 9 is a horizontal section made on line B--B of Fig. 8.

Fig. l0 represents on a smaller scale the method of controllinghconcurrentlythe movable pole pieces and e cam box.

As is shown in Figs. l and 2, the magneto comprises, as usual, magnets a upon whlch the fixed poles pieces b, b1 are mounted, andy an armature c rotating between the latter. In the concave face of each of the pole ieces b b1 is'formed a circular rroove b2 p 3 D for the reception of a movable pole piece d, d1. The width of these movable pole pieces d, all and the groove b2 in which they are displaceable is substantially the/same as that of the core'm of the armature c. :See Fig. 2a. The two movable pole pieces d, d1

are united by pieces of non-magnetic metal so as to form a ring.. These two ole pieces d, d1 may be united, as shown'in igs. 1 and 4,` by brass segments e, e1 for instance, fixed by riveting. or soldering and assembled either by a straight joint as shown in Fig.

4, or by anlinclined joint as shown in Fig.

6, or by 'any other form of joint. lSlots j are produced in the segments e, e1 in order to avold Foucault currents. An operating hanplaced at the Same time as the primary cir- ,'pendently/ of the cam box controllingmlzhe Ves cuit is broken and one can thus make sure that the flux; passing through the armature l'is always maximum and hence they energy of the spark remains constant both when the advanced or retarded position.

The'pole pieces d, d1 by reason of their A special disposition have moreover the advantage that when they p,are partially withdrawn from the polepieces b, b1 they direct the magnetic iux to'the central the armature and thus increase t e electrical' eiiiciency of the magneto. The ring of pole pieces d, d1 Amay be displaced indeadvance or retard of' the ignition. this ringis brought to the position'shown 1n Fig. 7 the polelpiece d forms a magnetic ortion of path between'A the two pole pieces Z), b1 and thus reduces the amount of .flux which thermore, when the ring (l, d1 is turned'as shown in- Fig. 8, so that the pole piece d is withdrawn, vthe groove-J22 increases the air gap as is shown in Figs. 8 and 9, and produces a resistance to the passage of the magnetic flux through the armature, so that this ux is no longer directed toward the central portion of the armature. vThis possibility of diverting the ma netic iux or of forming a resistance enabes the magneto to be used under the .best conditionsat variable 'speeds 'v For each case and for each output the Y should pass through the armature. t Furmost favorable position of the movable polepieces relatively to that of the armature at the momentof the break ofthe primary eircuit. will be determined in order to obtain the maximum output. The operating handle g of the movable pole pieces d, dlmay be p connected with the operating lever y' which' controls the advance or retard of ignition as t shown in Fig. 10. y It will be understood that the above described arrangement is only given by way of exampley and that the form, the dimensions,

and the details of construction of its constituent elements may be modified according to its dili'erent applications.

I claim: x 1. In an i ition magneto for an internal combustion engine, fixed pole pieces having a 'circular groove intermediateof Atheir ends, an armature havingpole pieces connected by a core, movable polev pieces, and. pieces of non-magnetic'metal uniting 'said movable pole pieces to constitutev aring, said movable pole pieces being interposedvbetween said fixed pole pieces and said armature, and being 'of a width substantially equal to that of the core of' said armature and said ring bein received in the circularV groove of said xed pole pieces.

2. In an ignition magneto" for an internal combustion engine', fixed pole pieces vin a circular `groove between the ends thereo an armature having pole pieces connected of non-magnetic metal uniting said `movable .by a core, movable pole pieces, and segments l pole' pieces to constitute a ring and formed,

with slots, said movable pole pieces being interposed'betweensaid fixed pole pieces and said armatureand being ofa width sub- Y stantially equal to that of the core of said armature, and said ring beingreceived in the circular groove of said lixed pole pieces.

. 3. In an ignition magneto for an internal combustion engine, fixed olepiec'es having a circular groove intermediate of their ends,`

van armature havin pole pieces connected by a core, a `n iovable s eeve-like member formed of pole pleces and pieces ofnon-magnetic metal provided with openings and connectsaid armature andbcing of a Width substantially equal to that of the ,core of said armature, and said sleeve-like member bein receilved in the circular groove of said Xed o e sleeve-like member. Y In an ignition magneto for an .internal combustion engine, a magnet, fixed pole p'eoes on said ma y roove, an armature having pole pieces con- /nected by a ycore, movable pole pieces, pieces of nonlmagnetic metal uniting said movable pole pieces to, constitute a ring, said movable pole pieces being interposed Vbetween said xed pole pieces and said armature, and being a -width substantially equal to that of the core of said armature and said ring bein 'received in the circular groove of said iixel pole pieces, and an operating handle mounted upon said@ ring and extending ieces, and means for turning the et and having a circularthrough a slot formed in one' of said fixed pole pieces and in said magnet.

5. nan ignition magneto for an internal .combustion engine, a magnet, fixed poleV pieces on said magnet and having a circular groove, an armature having pole' pleces connected by a core, movable pole pieces, pieces of non-magnetic metal uniting said movable pole pieces to constitute a ring, said movable pole pieces being 1 terposed between said iixed le'pieces and said armature, 'and being o a AWidth substantially equal to that ofthe core of said armature and said ring being received in the circular groove of said xedpole pieces, an operating handle mountedupon said ring, an operatinglever adapted to control the advance or retard of ignition, and means for connecting said operating handle with said operating lever.

EUGENE MALIVERT.

' `lliitness:

" Cans.v P. PnessLY. 

